The froth flotation method is primarily used to concentrate sulphide ores. For example ores of sulphide such as galena (\(\rm PbS \)), zinc blende (\(\rm ZnS \)) and copper pyrites(\(\rm CuFeS_{2} \)).

In froth flotation, the ore is mixed with water and chemicals that promote the separation of the valuable minerals from the gangue (waste material) by creating a froth, allowing the valuable minerals to be collected and concentrated.